mirror of https://gitee.com/openkylin/linux.git
919eb4756e
The Intel GPIO hardware has a concept of pad groups, which means 1 to 32 pads occupying their own GPI_IS, GPI_IE, PAD_OWN and so on registers. The existing hardware has the same amount of pads in each pad group (except the last one) so it is possible to use community->gpp_size to calculate start offset of each register. With the next generation SoCs the pad group size is not always the same anymore which means we cannot use community->gpp_size for register offset calculations directly. To support variable size pad groups we introduce struct intel_padgroup that can be filled in by the client drivers according the hardware pad group layout. The core driver will always use these when it performs calculations for pad register offsets. The core driver will automatically populate pad groups based on community->gpp_size if the driver does not provide any. This makes sure the existing drivers still work as expected. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@intel.com> Signed-off-by: Tan Jui Nee <jui.nee.tan@intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.